I have regular sewing scissors and some long curved scissors. The long curved ones are great for mowing down carpet plants but they don't cut easily through some stems plants because the long thin blades tend to flex. The short sewing scissors are great for those thicker stem plants.

As for tweezers, I have a pair of 6" curved tips, but I find I use my fingers most often because it always seems like the plants get caught on the tweezers, especially the roots, so I end up pulling the plant back out.